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Finding the Fourth Proportional to 72,694.70, 109,042.05 and 39,430.70

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Solution

The fourth proportional to 72,694.70, 109,042.05 and 39,430.70 is: 59,146.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,694.70 : 109,042.05 = 39,430.70 : x
  2. Step 2: Convert to fraction form
    72,694.70/109,042.05 = 39,430.70/x
  3. Step 3: Cross multiply
    72,694.70x = 109,042.05 × 39,430.70
  4. Step 4: Simplify right side
    72,694.70x = 4,299,604,360.94
  5. Step 5: Solve for x
    x = 4,299,604,360.94/72,694.70
  6. Step 6: Final answer
    x = 59,146.05

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.